net/rxrpc/af_rxrpc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* AF_RXRPC implementation
   3  *
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/net.h>
  13 #include <linux/slab.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/random.h>
  16 #include <linux/poll.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/key-type.h>
  19 #include <net/net_namespace.h>
  20 #include <net/sock.h>
  21 #include <net/af_rxrpc.h>
  22 #define CREATE_TRACE_POINTS
  23 #include "ar-internal.h"
  24
  25 MODULE_DESCRIPTION("RxRPC network protocol");
  26 MODULE_AUTHOR("Red Hat, Inc.");
  27 MODULE_LICENSE("GPL");
  28 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  29
  30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  31 module_param_named(debug, rxrpc_debug, uint, 0644);
  32 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  33
  34 static struct proto rxrpc_proto;
  35 static const struct proto_ops rxrpc_rpc_ops;
  36
  37 /* current debugging ID */
  38 atomic_t rxrpc_debug_id;
  39 EXPORT_SYMBOL(rxrpc_debug_id);
  40
  41 /* count of skbs currently in use */
  42 atomic_t rxrpc_n_rx_skbs;
  43
  44 struct workqueue_struct *rxrpc_workqueue;
  45
  46 static void rxrpc_sock_destructor(struct sock *);
  47
  48 /*
  49  * see if an RxRPC socket is currently writable
  50  */
  51 static inline int rxrpc_writable(struct sock *sk)
  52 {
  53         return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  54 }
  55
  56 /*
  57  * wait for write bufferage to become available
  58  */
  59 static void rxrpc_write_space(struct sock *sk)
  60 {
  61         _enter("%p", sk);
  62         rcu_read_lock();
  63         if (rxrpc_writable(sk)) {
  64                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
  65
  66                 if (skwq_has_sleeper(wq))
  67                         wake_up_interruptible(&wq->wait);
  68                 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
  69         }
  70         rcu_read_unlock();
  71 }
  72
  73 /*
  74  * validate an RxRPC address
  75  */
  76 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  77                                   struct sockaddr_rxrpc *srx,
  78                                   int len)
  79 {
  80         unsigned int tail;
  81
  82         if (len < sizeof(struct sockaddr_rxrpc))
  83                 return -EINVAL;
  84
  85         if (srx->srx_family != AF_RXRPC)
  86                 return -EAFNOSUPPORT;
  87
  88         if (srx->transport_type != SOCK_DGRAM)
  89                 return -ESOCKTNOSUPPORT;
  90
  91         len -= offsetof(struct sockaddr_rxrpc, transport);
  92         if (srx->transport_len < sizeof(sa_family_t) ||
  93             srx->transport_len > len)
  94                 return -EINVAL;
  95
  96         switch (srx->transport.family) {
  97         case AF_INET:
  98                 if (rx->family != AF_INET &&
  99                     rx->family != AF_INET6)
 100                         return -EAFNOSUPPORT;
 101                 if (srx->transport_len < sizeof(struct sockaddr_in))
 102                         return -EINVAL;
 103                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 104                 break;
 105
 106 #ifdef CONFIG_AF_RXRPC_IPV6
 107         case AF_INET6:
 108                 if (rx->family != AF_INET6)
 109                         return -EAFNOSUPPORT;
 110                 if (srx->transport_len < sizeof(struct sockaddr_in6))
 111                         return -EINVAL;
 112                 tail = offsetof(struct sockaddr_rxrpc, transport) +
 113                         sizeof(struct sockaddr_in6);
 114                 break;
 115 #endif
 116
 117         default:
 118                 return -EAFNOSUPPORT;
 119         }
 120
 121         if (tail < len)
 122                 memset((void *)srx + tail, 0, len - tail);
 123         _debug("INET: %pISp", &srx->transport);
 124         return 0;
 125 }
 126
 127 /*
 128  * bind a local address to an RxRPC socket
 129  */
 130 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 131 {
 132         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 133         struct rxrpc_local *local;
 134         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 135         u16 service_id;
 136         int ret;
 137
 138         _enter("%p,%p,%d", rx, saddr, len);
 139
 140         ret = rxrpc_validate_address(rx, srx, len);
 141         if (ret < 0)
 142                 goto error;
 143         service_id = srx->srx_service;
 144
 145         lock_sock(&rx->sk);
 146
 147         switch (rx->sk.sk_state) {
 148         case RXRPC_UNBOUND:
 149                 rx->srx = *srx;
 150                 local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
 151                 if (IS_ERR(local)) {
 152                         ret = PTR_ERR(local);
 153                         goto error_unlock;
 154                 }
 155
 156                 if (service_id) {
 157                         write_lock(&local->services_lock);
 158                         if (local->service)
 159                                 goto service_in_use;
 160                         rx->local = local;
 161                         local->service = rx;
 162                         write_unlock(&local->services_lock);
 163
 164                         rx->sk.sk_state = RXRPC_SERVER_BOUND;
 165                 } else {
 166                         rx->local = local;
 167                         rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 168                 }
 169                 break;
 170
 171         case RXRPC_SERVER_BOUND:
 172                 ret = -EINVAL;
 173                 if (service_id == 0)
 174                         goto error_unlock;
 175                 ret = -EADDRINUSE;
 176                 if (service_id == rx->srx.srx_service)
 177                         goto error_unlock;
 178                 ret = -EINVAL;
 179                 srx->srx_service = rx->srx.srx_service;
 180                 if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
 181                         goto error_unlock;
 182                 rx->second_service = service_id;
 183                 rx->sk.sk_state = RXRPC_SERVER_BOUND2;
 184                 break;
 185
 186         default:
 187                 ret = -EINVAL;
 188                 goto error_unlock;
 189         }
 190
 191         release_sock(&rx->sk);
 192         _leave(" = 0");
 193         return 0;
 194
 195 service_in_use:
 196         write_unlock(&local->services_lock);
 197         rxrpc_unuse_local(local, rxrpc_local_unuse_bind);
 198         rxrpc_put_local(local, rxrpc_local_put_bind);
 199         ret = -EADDRINUSE;
 200 error_unlock:
 201         release_sock(&rx->sk);
 202 error:
 203         _leave(" = %d", ret);
 204         return ret;
 205 }
 206
 207 /*
 208  * set the number of pending calls permitted on a listening socket
 209  */
 210 static int rxrpc_listen(struct socket *sock, int backlog)
 211 {
 212         struct sock *sk = sock->sk;
 213         struct rxrpc_sock *rx = rxrpc_sk(sk);
 214         unsigned int max, old;
 215         int ret;
 216
 217         _enter("%p,%d", rx, backlog);
 218
 219         lock_sock(&rx->sk);
 220
 221         switch (rx->sk.sk_state) {
 222         case RXRPC_UNBOUND:
 223                 ret = -EADDRNOTAVAIL;
 224                 break;
 225         case RXRPC_SERVER_BOUND:
 226         case RXRPC_SERVER_BOUND2:
 227                 ASSERT(rx->local != NULL);
 228                 max = READ_ONCE(rxrpc_max_backlog);
 229                 ret = -EINVAL;
 230                 if (backlog == INT_MAX)
 231                         backlog = max;
 232                 else if (backlog < 0 || backlog > max)
 233                         break;
 234                 old = sk->sk_max_ack_backlog;
 235                 sk->sk_max_ack_backlog = backlog;
 236                 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
 237                 if (ret == 0)
 238                         rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 239                 else
 240                         sk->sk_max_ack_backlog = old;
 241                 break;
 242         case RXRPC_SERVER_LISTENING:
 243                 if (backlog == 0) {
 244                         rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
 245                         sk->sk_max_ack_backlog = 0;
 246                         rxrpc_discard_prealloc(rx);
 247                         ret = 0;
 248                         break;
 249                 }
 250                 fallthrough;
 251         default:
 252                 ret = -EBUSY;
 253                 break;
 254         }
 255
 256         release_sock(&rx->sk);
 257         _leave(" = %d", ret);
 258         return ret;
 259 }
 260
 261 /**
 262  * rxrpc_kernel_lookup_peer - Obtain remote transport endpoint for an address
 263  * @sock: The socket through which it will be accessed
 264  * @srx: The network address
 265  * @gfp: Allocation flags
 266  *
 267  * Lookup or create a remote transport endpoint record for the specified
 268  * address and return it with a ref held.
 269  */
 270 struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock,
 271                                             struct sockaddr_rxrpc *srx, gfp_t gfp)
 272 {
 273         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 274         int ret;
 275
 276         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 277         if (ret < 0)
 278                 return ERR_PTR(ret);
 279
 280         return rxrpc_lookup_peer(rx->local, srx, gfp);
 281 }
 282 EXPORT_SYMBOL(rxrpc_kernel_lookup_peer);
 283
 284 /**
 285  * rxrpc_kernel_get_peer - Get a reference on a peer
 286  * @peer: The peer to get a reference on.
 287  *
 288  * Get a record for the remote peer in a call.
 289  */
 290 struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer)
 291 {
 292         return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL;
 293 }
 294 EXPORT_SYMBOL(rxrpc_kernel_get_peer);
 295
 296 /**
 297  * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference
 298  * @peer: The peer to drop a ref on
 299  */
 300 void rxrpc_kernel_put_peer(struct rxrpc_peer *peer)
 301 {
 302         rxrpc_put_peer(peer, rxrpc_peer_put_application);
 303 }
 304 EXPORT_SYMBOL(rxrpc_kernel_put_peer);
 305
 306 /**
 307  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 308  * @sock: The socket on which to make the call
 309  * @peer: The peer to contact
 310  * @key: The security context to use (defaults to socket setting)
 311  * @user_call_ID: The ID to use
 312  * @tx_total_len: Total length of data to transmit during the call (or -1)
 313  * @hard_timeout: The maximum lifespan of the call in sec
 314  * @gfp: The allocation constraints
 315  * @notify_rx: Where to send notifications instead of socket queue
 316  * @service_id: The ID of the service to contact
 317  * @upgrade: Request service upgrade for call
 318  * @interruptibility: The call is interruptible, or can be canceled.
 319  * @debug_id: The debug ID for tracing to be assigned to the call
 320  *
 321  * Allow a kernel service to begin a call on the nominated socket.  This just
 322  * sets up all the internal tracking structures and allocates connection and
 323  * call IDs as appropriate.  The call to be used is returned.
 324  *
 325  * The default socket destination address and security may be overridden by
 326  * supplying @srx and @key.
 327  */
 328 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 329                                            struct rxrpc_peer *peer,
 330                                            struct key *key,
 331                                            unsigned long user_call_ID,
 332                                            s64 tx_total_len,
 333                                            u32 hard_timeout,
 334                                            gfp_t gfp,
 335                                            rxrpc_notify_rx_t notify_rx,
 336                                            u16 service_id,
 337                                            bool upgrade,
 338                                            enum rxrpc_interruptibility interruptibility,
 339                                            unsigned int debug_id)
 340 {
 341         struct rxrpc_conn_parameters cp;
 342         struct rxrpc_call_params p;
 343         struct rxrpc_call *call;
 344         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 345
 346         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 347
 348         if (WARN_ON_ONCE(peer->local != rx->local))
 349                 return ERR_PTR(-EIO);
 350
 351         lock_sock(&rx->sk);
 352
 353         if (!key)
 354                 key = rx->key;
 355         if (key && !key->payload.data[0])
 356                 key = NULL; /* a no-security key */
 357
 358         memset(&p, 0, sizeof(p));
 359         p.user_call_ID          = user_call_ID;
 360         p.tx_total_len          = tx_total_len;
 361         p.interruptibility      = interruptibility;
 362         p.kernel                = true;
 363         p.timeouts.hard         = hard_timeout;
 364
 365         memset(&cp, 0, sizeof(cp));
 366         cp.local                = rx->local;
 367         cp.peer                 = peer;
 368         cp.key                  = key;
 369         cp.security_level       = rx->min_sec_level;
 370         cp.exclusive            = false;
 371         cp.upgrade              = upgrade;
 372         cp.service_id           = service_id;
 373         call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id);
 374         /* The socket has been unlocked. */
 375         if (!IS_ERR(call)) {
 376                 call->notify_rx = notify_rx;
 377                 mutex_unlock(&call->user_mutex);
 378         }
 379
 380         _leave(" = %p", call);
 381         return call;
 382 }
 383 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 384
 385 /*
 386  * Dummy function used to stop the notifier talking to recvmsg().
 387  */
 388 static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
 389                                   unsigned long call_user_ID)
 390 {
 391 }
 392
 393 /**
 394  * rxrpc_kernel_shutdown_call - Allow a kernel service to shut down a call it was using
 395  * @sock: The socket the call is on
 396  * @call: The call to end
 397  *
 398  * Allow a kernel service to shut down a call it was using.  The call must be
 399  * complete before this is called (the call should be aborted if necessary).
 400  */
 401 void rxrpc_kernel_shutdown_call(struct socket *sock, struct rxrpc_call *call)
 402 {
 403         _enter("%d{%d}", call->debug_id, refcount_read(&call->ref));
 404
 405         mutex_lock(&call->user_mutex);
 406         if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
 407                 rxrpc_release_call(rxrpc_sk(sock->sk), call);
 408
 409                 /* Make sure we're not going to call back into a kernel service */
 410                 if (call->notify_rx) {
 411                         spin_lock(&call->notify_lock);
 412                         call->notify_rx = rxrpc_dummy_notify_rx;
 413                         spin_unlock(&call->notify_lock);
 414                 }
 415         }
 416         mutex_unlock(&call->user_mutex);
 417 }
 418 EXPORT_SYMBOL(rxrpc_kernel_shutdown_call);
 419
 420 /**
 421  * rxrpc_kernel_put_call - Release a reference to a call
 422  * @sock: The socket the call is on
 423  * @call: The call to put
 424  *
 425  * Drop the application's ref on an rxrpc call.
 426  */
 427 void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call)
 428 {
 429         rxrpc_put_call(call, rxrpc_call_put_kernel);
 430 }
 431 EXPORT_SYMBOL(rxrpc_kernel_put_call);
 432
 433 /**
 434  * rxrpc_kernel_check_life - Check to see whether a call is still alive
 435  * @sock: The socket the call is on
 436  * @call: The call to check
 437  *
 438  * Allow a kernel service to find out whether a call is still alive - whether
 439  * it has completed successfully and all received data has been consumed.
 440  */
 441 bool rxrpc_kernel_check_life(const struct socket *sock,
 442                              const struct rxrpc_call *call)
 443 {
 444         if (!rxrpc_call_is_complete(call))
 445                 return true;
 446         if (call->completion != RXRPC_CALL_SUCCEEDED)
 447                 return false;
 448         return !skb_queue_empty(&call->recvmsg_queue);
 449 }
 450 EXPORT_SYMBOL(rxrpc_kernel_check_life);
 451
 452 /**
 453  * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
 454  * @sock: The socket the call is on
 455  * @call: The call to query
 456  *
 457  * Allow a kernel service to retrieve the epoch value from a service call to
 458  * see if the client at the other end rebooted.
 459  */
 460 u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
 461 {
 462         return call->conn->proto.epoch;
 463 }
 464 EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
 465
 466 /**
 467  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 468  * @sock: The socket to intercept received messages on
 469  * @notify_new_call: Function to be called when new calls appear
 470  * @discard_new_call: Function to discard preallocated calls
 471  *
 472  * Allow a kernel service to be given notifications about new calls.
 473  */
 474 void rxrpc_kernel_new_call_notification(
 475         struct socket *sock,
 476         rxrpc_notify_new_call_t notify_new_call,
 477         rxrpc_discard_new_call_t discard_new_call)
 478 {
 479         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 480
 481         rx->notify_new_call = notify_new_call;
 482         rx->discard_new_call = discard_new_call;
 483 }
 484 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 485
 486 /**
 487  * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
 488  * @sock: The socket the call is on
 489  * @call: The call to configure
 490  * @hard_timeout: The maximum lifespan of the call in ms
 491  *
 492  * Set the maximum lifespan of a call.  The call will end with ETIME or
 493  * ETIMEDOUT if it takes longer than this.
 494  */
 495 void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
 496                                unsigned long hard_timeout)
 497 {
 498         ktime_t delay = ms_to_ktime(hard_timeout), expect_term_by;
 499
 500         mutex_lock(&call->user_mutex);
 501
 502         expect_term_by = ktime_add(ktime_get_real(), delay);
 503         WRITE_ONCE(call->expect_term_by, expect_term_by);
 504         trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
 505         rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
 506
 507         mutex_unlock(&call->user_mutex);
 508 }
 509 EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
 510
 511 /*
 512  * connect an RxRPC socket
 513  * - this just targets it at a specific destination; no actual connection
 514  *   negotiation takes place
 515  */
 516 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 517                          int addr_len, int flags)
 518 {
 519         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 520         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 521         int ret;
 522
 523         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 524
 525         ret = rxrpc_validate_address(rx, srx, addr_len);
 526         if (ret < 0) {
 527                 _leave(" = %d [bad addr]", ret);
 528                 return ret;
 529         }
 530
 531         lock_sock(&rx->sk);
 532
 533         ret = -EISCONN;
 534         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 535                 goto error;
 536
 537         switch (rx->sk.sk_state) {
 538         case RXRPC_UNBOUND:
 539                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 540                 break;
 541         case RXRPC_CLIENT_UNBOUND:
 542         case RXRPC_CLIENT_BOUND:
 543                 break;
 544         default:
 545                 ret = -EBUSY;
 546                 goto error;
 547         }
 548
 549         rx->connect_srx = *srx;
 550         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 551         ret = 0;
 552
 553 error:
 554         release_sock(&rx->sk);
 555         return ret;
 556 }
 557
 558 /*
 559  * send a message through an RxRPC socket
 560  * - in a client this does a number of things:
 561  *   - finds/sets up a connection for the security specified (if any)
 562  *   - initiates a call (ID in control data)
 563  *   - ends the request phase of a call (if MSG_MORE is not set)
 564  *   - sends a call data packet
 565  *   - may send an abort (abort code in control data)
 566  */
 567 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 568 {
 569         struct rxrpc_local *local;
 570         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 571         int ret;
 572
 573         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 574
 575         if (m->msg_flags & MSG_OOB)
 576                 return -EOPNOTSUPP;
 577
 578         if (m->msg_name) {
 579                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 580                 if (ret < 0) {
 581                         _leave(" = %d [bad addr]", ret);
 582                         return ret;
 583                 }
 584         }
 585
 586         lock_sock(&rx->sk);
 587
 588         switch (rx->sk.sk_state) {
 589         case RXRPC_UNBOUND:
 590         case RXRPC_CLIENT_UNBOUND:
 591                 rx->srx.srx_family = AF_RXRPC;
 592                 rx->srx.srx_service = 0;
 593                 rx->srx.transport_type = SOCK_DGRAM;
 594                 rx->srx.transport.family = rx->family;
 595                 switch (rx->family) {
 596                 case AF_INET:
 597                         rx->srx.transport_len = sizeof(struct sockaddr_in);
 598                         break;
 599 #ifdef CONFIG_AF_RXRPC_IPV6
 600                 case AF_INET6:
 601                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
 602                         break;
 603 #endif
 604                 default:
 605                         ret = -EAFNOSUPPORT;
 606                         goto error_unlock;
 607                 }
 608                 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
 609                 if (IS_ERR(local)) {
 610                         ret = PTR_ERR(local);
 611                         goto error_unlock;
 612                 }
 613
 614                 rx->local = local;
 615                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 616                 fallthrough;
 617
 618         case RXRPC_CLIENT_BOUND:
 619                 if (!m->msg_name &&
 620                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 621                         m->msg_name = &rx->connect_srx;
 622                         m->msg_namelen = sizeof(rx->connect_srx);
 623                 }
 624                 fallthrough;
 625         case RXRPC_SERVER_BOUND:
 626         case RXRPC_SERVER_LISTENING:
 627                 ret = rxrpc_do_sendmsg(rx, m, len);
 628                 /* The socket has been unlocked */
 629                 goto out;
 630         default:
 631                 ret = -EINVAL;
 632                 goto error_unlock;
 633         }
 634
 635 error_unlock:
 636         release_sock(&rx->sk);
 637 out:
 638         _leave(" = %d", ret);
 639         return ret;
 640 }
 641
 642 int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
 643 {
 644         if (sk->sk_state != RXRPC_UNBOUND)
 645                 return -EISCONN;
 646         if (val > RXRPC_SECURITY_MAX)
 647                 return -EINVAL;
 648         lock_sock(sk);
 649         rxrpc_sk(sk)->min_sec_level = val;
 650         release_sock(sk);
 651         return 0;
 652 }
 653 EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
 654
 655 /*
 656  * set RxRPC socket options
 657  */
 658 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 659                             sockptr_t optval, unsigned int optlen)
 660 {
 661         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 662         unsigned int min_sec_level;
 663         u16 service_upgrade[2];
 664         int ret;
 665
 666         _enter(",%d,%d,,%d", level, optname, optlen);
 667
 668         lock_sock(&rx->sk);
 669         ret = -EOPNOTSUPP;
 670
 671         if (level == SOL_RXRPC) {
 672                 switch (optname) {
 673                 case RXRPC_EXCLUSIVE_CONNECTION:
 674                         ret = -EINVAL;
 675                         if (optlen != 0)
 676                                 goto error;
 677                         ret = -EISCONN;
 678                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 679                                 goto error;
 680                         rx->exclusive = true;
 681                         goto success;
 682
 683                 case RXRPC_SECURITY_KEY:
 684                         ret = -EINVAL;
 685                         if (rx->key)
 686                                 goto error;
 687                         ret = -EISCONN;
 688                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 689                                 goto error;
 690                         ret = rxrpc_request_key(rx, optval, optlen);
 691                         goto error;
 692
 693                 case RXRPC_SECURITY_KEYRING:
 694                         ret = -EINVAL;
 695                         if (rx->key)
 696                                 goto error;
 697                         ret = -EISCONN;
 698                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 699                                 goto error;
 700                         ret = rxrpc_server_keyring(rx, optval, optlen);
 701                         goto error;
 702
 703                 case RXRPC_MIN_SECURITY_LEVEL:
 704                         ret = -EINVAL;
 705                         if (optlen != sizeof(unsigned int))
 706                                 goto error;
 707                         ret = -EISCONN;
 708                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 709                                 goto error;
 710                         ret = copy_safe_from_sockptr(&min_sec_level,
 711                                                      sizeof(min_sec_level),
 712                                                      optval, optlen);
 713                         if (ret)
 714                                 goto error;
 715                         ret = -EINVAL;
 716                         if (min_sec_level > RXRPC_SECURITY_MAX)
 717                                 goto error;
 718                         rx->min_sec_level = min_sec_level;
 719                         goto success;
 720
 721                 case RXRPC_UPGRADEABLE_SERVICE:
 722                         ret = -EINVAL;
 723                         if (optlen != sizeof(service_upgrade) ||
 724                             rx->service_upgrade.from != 0)
 725                                 goto error;
 726                         ret = -EISCONN;
 727                         if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
 728                                 goto error;
 729                         ret = -EFAULT;
 730                         if (copy_from_sockptr(service_upgrade, optval,
 731                                            sizeof(service_upgrade)) != 0)
 732                                 goto error;
 733                         ret = -EINVAL;
 734                         if ((service_upgrade[0] != rx->srx.srx_service ||
 735                              service_upgrade[1] != rx->second_service) &&
 736                             (service_upgrade[0] != rx->second_service ||
 737                              service_upgrade[1] != rx->srx.srx_service))
 738                                 goto error;
 739                         rx->service_upgrade.from = service_upgrade[0];
 740                         rx->service_upgrade.to = service_upgrade[1];
 741                         goto success;
 742
 743                 default:
 744                         break;
 745                 }
 746         }
 747
 748 success:
 749         ret = 0;
 750 error:
 751         release_sock(&rx->sk);
 752         return ret;
 753 }
 754
 755 /*
 756  * Get socket options.
 757  */
 758 static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
 759                             char __user *optval, int __user *_optlen)
 760 {
 761         int optlen;
 762
 763         if (level != SOL_RXRPC)
 764                 return -EOPNOTSUPP;
 765
 766         if (get_user(optlen, _optlen))
 767                 return -EFAULT;
 768
 769         switch (optname) {
 770         case RXRPC_SUPPORTED_CMSG:
 771                 if (optlen < sizeof(int))
 772                         return -ETOOSMALL;
 773                 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
 774                     put_user(sizeof(int), _optlen))
 775                         return -EFAULT;
 776                 return 0;
 777
 778         default:
 779                 return -EOPNOTSUPP;
 780         }
 781 }
 782
 783 /*
 784  * permit an RxRPC socket to be polled
 785  */
 786 static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
 787                                poll_table *wait)
 788 {
 789         struct sock *sk = sock->sk;
 790         struct rxrpc_sock *rx = rxrpc_sk(sk);
 791         __poll_t mask;
 792
 793         sock_poll_wait(file, sock, wait);
 794         mask = 0;
 795
 796         /* the socket is readable if there are any messages waiting on the Rx
 797          * queue */
 798         if (!list_empty(&rx->recvmsg_q))
 799                 mask |= EPOLLIN | EPOLLRDNORM;
 800
 801         /* the socket is writable if there is space to add new data to the
 802          * socket; there is no guarantee that any particular call in progress
 803          * on the socket may have space in the Tx ACK window */
 804         if (rxrpc_writable(sk))
 805                 mask |= EPOLLOUT | EPOLLWRNORM;
 806
 807         return mask;
 808 }
 809
 810 /*
 811  * create an RxRPC socket
 812  */
 813 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 814                         int kern)
 815 {
 816         struct rxrpc_net *rxnet;
 817         struct rxrpc_sock *rx;
 818         struct sock *sk;
 819
 820         _enter("%p,%d", sock, protocol);
 821
 822         /* we support transport protocol UDP/UDP6 only */
 823         if (protocol != PF_INET &&
 824             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
 825                 return -EPROTONOSUPPORT;
 826
 827         if (sock->type != SOCK_DGRAM)
 828                 return -ESOCKTNOSUPPORT;
 829
 830         sock->ops = &rxrpc_rpc_ops;
 831         sock->state = SS_UNCONNECTED;
 832
 833         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 834         if (!sk)
 835                 return -ENOMEM;
 836
 837         sock_init_data(sock, sk);
 838         sock_set_flag(sk, SOCK_RCU_FREE);
 839         sk->sk_state            = RXRPC_UNBOUND;
 840         sk->sk_write_space      = rxrpc_write_space;
 841         sk->sk_max_ack_backlog  = 0;
 842         sk->sk_destruct         = rxrpc_sock_destructor;
 843
 844         rx = rxrpc_sk(sk);
 845         rx->family = protocol;
 846         rx->calls = RB_ROOT;
 847
 848         spin_lock_init(&rx->incoming_lock);
 849         INIT_LIST_HEAD(&rx->sock_calls);
 850         INIT_LIST_HEAD(&rx->to_be_accepted);
 851         INIT_LIST_HEAD(&rx->recvmsg_q);
 852         spin_lock_init(&rx->recvmsg_lock);
 853         rwlock_init(&rx->call_lock);
 854         memset(&rx->srx, 0, sizeof(rx->srx));
 855
 856         rxnet = rxrpc_net(sock_net(&rx->sk));
 857         timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
 858
 859         _leave(" = 0 [%p]", rx);
 860         return 0;
 861 }
 862
 863 /*
 864  * Kill all the calls on a socket and shut it down.
 865  */
 866 static int rxrpc_shutdown(struct socket *sock, int flags)
 867 {
 868         struct sock *sk = sock->sk;
 869         struct rxrpc_sock *rx = rxrpc_sk(sk);
 870         int ret = 0;
 871
 872         _enter("%p,%d", sk, flags);
 873
 874         if (flags != SHUT_RDWR)
 875                 return -EOPNOTSUPP;
 876         if (sk->sk_state == RXRPC_CLOSE)
 877                 return -ESHUTDOWN;
 878
 879         lock_sock(sk);
 880
 881         if (sk->sk_state < RXRPC_CLOSE) {
 882                 sk->sk_state = RXRPC_CLOSE;
 883                 sk->sk_shutdown = SHUTDOWN_MASK;
 884         } else {
 885                 ret = -ESHUTDOWN;
 886         }
 887
 888         rxrpc_discard_prealloc(rx);
 889
 890         release_sock(sk);
 891         return ret;
 892 }
 893
 894 /*
 895  * RxRPC socket destructor
 896  */
 897 static void rxrpc_sock_destructor(struct sock *sk)
 898 {
 899         _enter("%p", sk);
 900
 901         rxrpc_purge_queue(&sk->sk_receive_queue);
 902
 903         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 904         WARN_ON(!sk_unhashed(sk));
 905         WARN_ON(sk->sk_socket);
 906
 907         if (!sock_flag(sk, SOCK_DEAD)) {
 908                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 909                 return;
 910         }
 911 }
 912
 913 /*
 914  * release an RxRPC socket
 915  */
 916 static int rxrpc_release_sock(struct sock *sk)
 917 {
 918         struct rxrpc_sock *rx = rxrpc_sk(sk);
 919
 920         _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
 921
 922         /* declare the socket closed for business */
 923         sock_orphan(sk);
 924         sk->sk_shutdown = SHUTDOWN_MASK;
 925
 926         /* We want to kill off all connections from a service socket
 927          * as fast as possible because we can't share these; client
 928          * sockets, on the other hand, can share an endpoint.
 929          */
 930         switch (sk->sk_state) {
 931         case RXRPC_SERVER_BOUND:
 932         case RXRPC_SERVER_BOUND2:
 933         case RXRPC_SERVER_LISTENING:
 934         case RXRPC_SERVER_LISTEN_DISABLED:
 935                 rx->local->service_closed = true;
 936                 break;
 937         }
 938
 939         sk->sk_state = RXRPC_CLOSE;
 940
 941         if (rx->local && rx->local->service == rx) {
 942                 write_lock(&rx->local->services_lock);
 943                 rx->local->service = NULL;
 944                 write_unlock(&rx->local->services_lock);
 945         }
 946
 947         /* try to flush out this socket */
 948         rxrpc_discard_prealloc(rx);
 949         rxrpc_release_calls_on_socket(rx);
 950         flush_workqueue(rxrpc_workqueue);
 951         rxrpc_purge_queue(&sk->sk_receive_queue);
 952
 953         rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock);
 954         rxrpc_put_local(rx->local, rxrpc_local_put_release_sock);
 955         rx->local = NULL;
 956         key_put(rx->key);
 957         rx->key = NULL;
 958         key_put(rx->securities);
 959         rx->securities = NULL;
 960         sock_put(sk);
 961
 962         _leave(" = 0");
 963         return 0;
 964 }
 965
 966 /*
 967  * release an RxRPC BSD socket on close() or equivalent
 968  */
 969 static int rxrpc_release(struct socket *sock)
 970 {
 971         struct sock *sk = sock->sk;
 972
 973         _enter("%p{%p}", sock, sk);
 974
 975         if (!sk)
 976                 return 0;
 977
 978         sock->sk = NULL;
 979
 980         return rxrpc_release_sock(sk);
 981 }
 982
 983 /*
 984  * RxRPC network protocol
 985  */
 986 static const struct proto_ops rxrpc_rpc_ops = {
 987         .family         = PF_RXRPC,
 988         .owner          = THIS_MODULE,
 989         .release        = rxrpc_release,
 990         .bind           = rxrpc_bind,
 991         .connect        = rxrpc_connect,
 992         .socketpair     = sock_no_socketpair,
 993         .accept         = sock_no_accept,
 994         .getname        = sock_no_getname,
 995         .poll           = rxrpc_poll,
 996         .ioctl          = sock_no_ioctl,
 997         .listen         = rxrpc_listen,
 998         .shutdown       = rxrpc_shutdown,
 999         .setsockopt     = rxrpc_setsockopt,
1000         .getsockopt     = rxrpc_getsockopt,
1001         .sendmsg        = rxrpc_sendmsg,
1002         .recvmsg        = rxrpc_recvmsg,
1003         .mmap           = sock_no_mmap,
1004 };
1005
1006 static struct proto rxrpc_proto = {
1007         .name           = "RXRPC",
1008         .owner          = THIS_MODULE,
1009         .obj_size       = sizeof(struct rxrpc_sock),
1010         .max_header     = sizeof(struct rxrpc_wire_header),
1011 };
1012
1013 static const struct net_proto_family rxrpc_family_ops = {
1014         .family = PF_RXRPC,
1015         .create = rxrpc_create,
1016         .owner  = THIS_MODULE,
1017 };
1018
1019 /*
1020  * initialise and register the RxRPC protocol
1021  */
1022 static int __init af_rxrpc_init(void)
1023 {
1024         int ret = -1;
1025
1026         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
1027
1028         ret = -ENOMEM;
1029         rxrpc_gen_version_string();
1030         rxrpc_call_jar = kmem_cache_create(
1031                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
1032                 SLAB_HWCACHE_ALIGN, NULL);
1033         if (!rxrpc_call_jar) {
1034                 pr_notice("Failed to allocate call jar\n");
1035                 goto error_call_jar;
1036         }
1037
1038         rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM);
1039         if (!rxrpc_workqueue) {
1040                 pr_notice("Failed to allocate work queue\n");
1041                 goto error_work_queue;
1042         }
1043
1044         ret = rxrpc_init_security();
1045         if (ret < 0) {
1046                 pr_crit("Cannot initialise security\n");
1047                 goto error_security;
1048         }
1049
1050         ret = register_pernet_device(&rxrpc_net_ops);
1051         if (ret)
1052                 goto error_pernet;
1053
1054         ret = proto_register(&rxrpc_proto, 1);
1055         if (ret < 0) {
1056                 pr_crit("Cannot register protocol\n");
1057                 goto error_proto;
1058         }
1059
1060         ret = sock_register(&rxrpc_family_ops);
1061         if (ret < 0) {
1062                 pr_crit("Cannot register socket family\n");
1063                 goto error_sock;
1064         }
1065
1066         ret = register_key_type(&key_type_rxrpc);
1067         if (ret < 0) {
1068                 pr_crit("Cannot register client key type\n");
1069                 goto error_key_type;
1070         }
1071
1072         ret = register_key_type(&key_type_rxrpc_s);
1073         if (ret < 0) {
1074                 pr_crit("Cannot register server key type\n");
1075                 goto error_key_type_s;
1076         }
1077
1078         ret = rxrpc_sysctl_init();
1079         if (ret < 0) {
1080                 pr_crit("Cannot register sysctls\n");
1081                 goto error_sysctls;
1082         }
1083
1084         return 0;
1085
1086 error_sysctls:
1087         unregister_key_type(&key_type_rxrpc_s);
1088 error_key_type_s:
1089         unregister_key_type(&key_type_rxrpc);
1090 error_key_type:
1091         sock_unregister(PF_RXRPC);
1092 error_sock:
1093         proto_unregister(&rxrpc_proto);
1094 error_proto:
1095         unregister_pernet_device(&rxrpc_net_ops);
1096 error_pernet:
1097         rxrpc_exit_security();
1098 error_security:
1099         destroy_workqueue(rxrpc_workqueue);
1100 error_work_queue:
1101         kmem_cache_destroy(rxrpc_call_jar);
1102 error_call_jar:
1103         return ret;
1104 }
1105
1106 /*
1107  * unregister the RxRPC protocol
1108  */
1109 static void __exit af_rxrpc_exit(void)
1110 {
1111         _enter("");
1112         rxrpc_sysctl_exit();
1113         unregister_key_type(&key_type_rxrpc_s);
1114         unregister_key_type(&key_type_rxrpc);
1115         sock_unregister(PF_RXRPC);
1116         proto_unregister(&rxrpc_proto);
1117         unregister_pernet_device(&rxrpc_net_ops);
1118         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1119
1120         /* Make sure the local and peer records pinned by any dying connections
1121          * are released.
1122          */
1123         rcu_barrier();
1124
1125         destroy_workqueue(rxrpc_workqueue);
1126         rxrpc_exit_security();
1127         kmem_cache_destroy(rxrpc_call_jar);
1128         _leave("");
1129 }
1130
1131 module_init(af_rxrpc_init);
1132 module_exit(af_rxrpc_exit);